/**
 * The MIT License
 *
 * Copyright (c) 2010 Benjamin Klum
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.helgoboss.osgi_console_log_listener;


import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.log.LogEntry;
import org.osgi.service.log.LogListener;
import org.osgi.service.log.LogReaderService;
import org.osgi.util.tracker.ServiceTracker;

public class OsgiConsoleLogListener implements LogListener, BundleActivator {
	
	private ServiceTracker logReaderTracker;
	
    public void logged(LogEntry log) {
        if (log.getMessage() != null) {
            System.out.println("[" + log.getBundle().getSymbolicName() + "] " + log.getMessage());
        }
    }

	/**
	 * {@inheritDoc}
	 */
	public void start(BundleContext context) throws Exception {
		logReaderTracker = new ServiceTracker(context, LogReaderService.class.getName(), null) {
			@Override
			public Object addingService(ServiceReference reference) {
				LogReaderService logReader = (LogReaderService) context.getService(reference);
				if (logReader != null) {
					logReader.addLogListener(OsgiConsoleLogListener.this);
				}
				return logReader;
			}

			@Override
			public void removedService(ServiceReference reference, Object service) {
				LogReaderService logReader = (LogReaderService) service;
				if (logReader != null) {
					logReader.removeLogListener(OsgiConsoleLogListener.this);
				}
				context.ungetService(reference);
			}
		};
		logReaderTracker.open();
	}

	/**
	 * {@inheritDoc}
	 */
	public void stop(BundleContext context) throws Exception {
		Object[] logReaders = logReaderTracker.getServices();
		if (logReaders != null) {
			for (Object obj: logReaders) {
				LogReaderService logReader = (LogReaderService) obj;
				logReader.removeLogListener(this);
			}
		}
		logReaderTracker.close();
	}


}
